Appendices
193
[ 2 ] Aborting Data Transmission
Pressing the C key aborts data transmission.
If the C key is pressed during downloading, the BHT transmits an EOT and aborts the file transmission.
If it is pressed during uploading, the BHT transmits the current transmission block followed by EOT and
then aborts the file transmission.
[ 3 ] BCC for Horizontal Parity Checking
To check whether data has been transmitted accurately, the BHT supports horizontal parity checking for
every transmission block.
In horizontal parity checking, a horizontal parity byte so called BCC (Block Check Character) is suffixed
to an ETX of every transmission block.
In the BHT-protocol, every parity bit of BCC is set so that all set bits at the same bit level (including a
parity bit) in the characters contained in the transmission block have an even number by binary addition,
excluding SOH, STX, and functions SOH$ and STX$.
(For details about SOH$ and STX$ which are protocol functions unique to BHT-BASIC, refer to the
"BHT-BASIC Programmer's Manual.")
Shown below is a data text block indicating the bits to be added for horizontal parity checking.
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